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Surgical procedures are accompanied with anxiety and stress for both patients and surgeons. This paper investigates the utility of various heart rate variability parameters, estimated from Savvy patch ECG recordings, obtained on patients during surgical extraction of impacted lower third molars under local anesthesia, to estimate psychological state of the patient, as well as pain levels, in real time. This could be particularly beneficial for patients with chronic conditions, such as cardiovascular diseases, that can deteriorate under psychophysical stress. Statistical analysis showed significant correlation between several heart rate variability parameters and changes in autonomous nervous system functionality. Additionally, there was a significant correlation between several heart rate variability parameters on one side, and patient reported anxiety, pain levels, and the procedure difficulty, on the other.